window.addEvent('load', function(){
var switchToContent = function(newContent){
// hide all of the content
var all_content = $$('.page_content');
all_content.each(function(content){
	if(content != newContent){
		content.setStyle('display','none');
	}
});
newContent.setStyle('display','block');
}

switchToContent($('about_content'));




var cv_btn = {
	element: $('cv_btn'), 
	init: function(){ // event listeners
		this.element.addEvent('click', function(event){
			event = new Event(event);
			event.stopPropagation();
			// switch to new content
			switchToContent($('cv_content'));
		});
	}
}.init();

var about_btn = {
	element: $('about_btn'), 
	init: function(){ // event listeners
		this.element.addEvent('click', function(event){
			event = new Event(event);
			event.stopPropagation();
			// switch to new content
			switchToContent($('about_content'));
		});
	}
}.init();

var dog_btn = {
	element: $('dog_btn'), 
	init: function(){ // event listeners
		this.element.addEvent('click', function(event){
			event = new Event(event);
			event.stopPropagation();
			// switch to new content
			switchToContent($('dog_content'));
		});
	}
}.init();
});